Originally Posted by
Just_Me_D Why are you using "Safari" to search for an app on your iPhone? While viewing your home screen, swipe downward on the screen to reveal the Spotlight search feature. Type "Activity" in the search field and allow the app to be located and then select it. If the Activity app is indeed not installed, go to the App Store app on your iPhone X and install it. You can use the following link.
https://apps.apple.com/us/app/activity/id1208224953 I have tried App store with my phone first but nothing was found, then tried Safari, this time I could find the Activity app, but it doesn't allow me to install it and I get this message "This app requires specific features not available on this device."
Obviously I have tried to search and find the app in my phone first, but as I mentioned it is not installed on my phone. I have used the link you provided as well but still I am getting the same message "This app requires specific features not available on this device."